Hummer 2003 H2 Owner's Manual page 344

3. Then go to the front of the vehicle and pull the assist
handles toward you to lift the hood.
4. Pull the hood open until it is supported by the cables.
5. Now go to the driver's side of the hood and locate
the prop rod.
6-10
6. Pull the end of the prop rod from its holder and place
it into the slot built into the hood.